I'm glad Fernando posted this, and I think it is indeed a valid subject whether ethnographic weapon or not as it is in degree associated. Just as with edged weapons, the weapons of colonial powers often diffused into native armouries and if nothing else, even the firearms are interesting from historical perspective.
I fail to see what possible connection there is between negative associations with the guns of today and historical weapons of yesteryear. I do not particularly 'like' guns either as a result of unfortunate personal experience, however I do very much enjoy the 'history of weapons' overall.
Getting to the question, probably one good source would be the 'antique and military swords forum over on SFI. The guys over there seem to be equally involved in one degree or another with a wide scope of weaponry, and I am sure many would have certain knowledge on guns of this period. One of the best sources, if you ever can find them, are auction catalogs, as far as simple identification. As far as books, "British Military Firearms" by Howard Blackmore (I do not recall date) has excellent information, however it would seem your pistol is private issue.
The 'Queen Anne' period is a highly romanticized period, mostly for its associations with the 'golden age' of piracy, and your pistol certainly seems to handsomely represent the time, an extremely nice example.
I hope this will be of some help
All the best ,
Jim